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This is a list of characters in the 1993 animated series Animaniacs and its 2020 revival.

The Warner Siblings (also known as "the Animaniacs" by fans and the media) are small, silly, mischievous, anthropomorphic toon siblings of unknown origin and the central titular characters of the series; they generally introduce and identify themselves as "the Warner Brothers (and the Warner Sister)". Their species is never made clear: this has been satirized several times, most prominently in the song "What Are We?".

Pinky (voiced by Rob Paulsen) and the Brain (voiced by Maurice LaMarche) are two anthropomorphic white mice kept in a cage at ACME Labs. The Brain is serious and devious, the leader, and constantly devising plans to conquer the world. He resembles and sounds like Orson Welles. Pinky is eccentric and simple-minded but loyal to the Brain. In 1995, they were spun off into a cartoon series of their own. As of now, they are the only non-Warner Siblings segment to regularly appear in the 2020 revival series where Brain appears as more villainous. The revival revealed that the reason why Brain wants to take over the world is that he was frustrated and angered by how the scientists mistreated him when they demonstrated his helplessness during his youth, and since then, he vowed that he would be in control of what happens around him.

The Goodfeathers are an Italian American trio of anthropomorphic pigeons: Squit (gray), Bobby (turquoise), and Pesto (lavender), who were voiced by Maurice LaMarche, John Mariano and Chick Vennera, influenced by Ray Liotta, Robert De Niro, and Joe Pesci's roles in Goodfellas. They always get into different situations. When Squit makes a comment about something, Pesto would aggressively inquire about it which would lead to Pesto beating up Squit.